Yamaha R15 2022 Service Manual page 427

FUEL INJECTION SYSTEM TROUBLESHOOTING
Fault code No. Er-2
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of meter assembly
coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
2 Connection of ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
3 Wire harness continuity.
4 Defective meter assembly.
5 Malfunction in ECU.
Er-2
Normal signal is not received from the ECU within the specification
duration.
Able to start engine
Able to drive vehicle
—
—
—
Maintenance job
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
Open or short circuit → Replace
the wire harness.
Between meter assembly cou-
pler and ECU coupler.
yellow/blue–yellow/blue
Replace the meter assembly.
Replace ECU.
8-94
ELEC
Confirmation of service com-
pletion
Turn the main switch to "ON",
and then check the condition of
the fault code.
Fault code is not displayed →
Service is finished.
Fault code is displayed → Go to
item 2.
Turn the main switch to "ON",
and then check the condition of
the fault code.
Fault code is not displayed →
Service is finished.
Fault code is displayed → Go to
item 3.
Turn the main switch to "ON",
and then check the condition of
the fault code.
Fault code is not displayed →
Service is finished. Fault code is
displayed → Go to item 4.
Turn the main switch to "ON",
and then check the condition of
the fault code.
Fault code is not displayed →
Service is finished.
Fault code is displayed → Go to
item 5.
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